Fracture of articular cartilage
Fracture of articular cartilage
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DOI：
10.1115/1.2796042
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发表时间：
1996-11-01
影响因子：
1.7
通讯作者：
Lewis, JL
中科院分区：
文献类型：
--
作者：
ChinPurcell, MV;Lewis, JL
裂纹的形成和扩展是关节软骨退变过程中的重要因素。为了理解这个过程，并分离结构过载和材料失效的相对重要性，需要测量软骨的断裂韧性的方法。本文描述了两种这样的方法，并用于测量犬髌骨软骨的断裂特性。使用改进的单边缺口（MSEN）试样测量J，并使用裤形梁试验测量T，两种断裂韧性的测量单位均为kN/m。还从MSEN测试获得伪弹性模量。几个潜在的误差源进行了检查，并与另一种方法测量聚氨酯橡胶的断裂参数的MSEN测试的结果进行了比较。用这两种方法测量了12只犬髌骨软骨的性质：12只髌骨中每只髌骨4-9个标本，左右各5对。J值范围为0.14-1.2 kN/m。J值与T相关，平均为T的1.7倍。在MSEN试验中观察到各种失效响应，因此，将0至3级分配给每个试验，其中0表示具有最小开口的脆性样裂纹，3表示没有裂纹形成的塑性流动。12/82个样本中的初始裂纹没有扩展，被指定为3级。在MSEN试验中减少数据的方法假定为伪弹性响应，不能用于3级试件。刚度也不与J。J和T都没有统计学差异之间的右-左对，但动物之间的变化。该测试方法似乎可用于提供软骨和其他软材料的断裂韧性的定量测量。
Crack formation and propagation is a significant element of the degeneration process in articular cartilage. In order to understand this process, and separate the relative importance of structural overload and material failure, methods for measuring the fracture toughness of cartilage are needed In this paper; two such methods are described and used to measure fracture properties of cartilage from the canine patella. A modified single edge notch (MSEN) specimen was used to measure J, and a trouser lear test was used to measure T, both measures of fracture toughness with units of kN/m. A pseudo-elastic modulus was also obtained from the MSEN test. Several potential error sources were examined, and results for the MSEN test compared with another method for measuring the fracture parameter for urethane rubber. Good agreement was found. The two test methods were used to measure properties of cartilage from the patellae of 12 canines: 4-9 specimens from each of 12 patellae, with 5 right-left pairs were tested. Values of J ranged from 0.14-1.2 kN/m. J values correlated with T and were an average of 1.7 times larger than T. A variety of failure responses was seen in the MSEN rests, consequently a grade of 0 to 3 was assigned to each test, where 0 represented a brittle-like crack with minimal opening and 3 represented plastic flow with no crack formation. The initial cracks in 12/82 specimens did not propagate and were assigned to grade 3. The method for reducing data in the MSEN test assumed pseudo-elastic response and could not be used for the grade 3 specimens. Stiffness did nor correlate with J. Neither J nor T was statistically different between right-left pairs, but varied between animals. The test methods appear useful for providing a quantitative measure of fracture toughness for cartilage and other soft materials.